The Greatest County in the Land
Location within the U.S. state of New Jersey
New Jersey's location within the U.S.
|Named for||Historic English county of Middlesex|
|Largest city||Edison (population)|
Monroe Township (area)
|• Commissioner director||Ronald G. Rios (D, term ends December 31, 2017)|
|• Total||322.83 sq mi (836.1 km2)|
|• Land||308.91 sq mi (800.1 km2)|
|• Water||13.91 sq mi (36.0 km2) 4.31%|
| • Estimate |
|• Density||2,500/sq mi (970/km2)|
|Congressional districts||6th, 12th|
Middlesex County is located in central New Jersey, United States. In 2019, the Census Bureau estimated the county's population at 825,062, making it the state's second-most populous county, an increase of 4.1% from 809,858 in the 2010 census. Middlesex is part of the New York metropolitan area, and its county seat is New Brunswick. The center of population of the state of New Jersey is located in Middlesex County, in East Brunswick Township, just east of the New Jersey Turnpike. The 2000 Census showed that the county ranked 63rd in the United States among the wealthiest counties by median household income. The Bureau of Economic Analysis ranked the county as having the 143rd-highest per capita income of all 3,113 counties in the United States (and the 10th-highest in New Jersey) as of 2009. Middlesex County holds the nickname, The Greatest County in the Land.
The county was primarily settled due to its ideal location near the Raritan River and was established as of March 7, 1683, as part of the Province of East Jersey and was partitioned as of October 31, 1693, into the townships of Piscataway, Perth Amboy, and Woodbridge. Somerset County was established on May 14, 1688, from portions of Middlesex County. The county's first court met in June 1683 in Piscataway, and held session at alternating sites over the next century in Perth Amboy, Piscataway, and Woodbridge before relocating permanently to New Brunswick in 1778. Middlesex County hosts an extensive park system totaling more than 6,300 acres (2,500 ha).
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